一个裁剪图片的小工具类,通过一句代码调用

前些时间空闲,写了个简单的小小工具类,即图片的裁剪,动画改变frame隐藏;

本类直接提供一个类方法调用,传入3个参数即可,代码非常简单,谁都可以看懂;

参数说明:

第一个参数:你要将裁剪后的图片添加到哪个视图上执行动画,传入当前view即可;

第二个参数:传入一张你要进行裁剪的图片;

第三个参数:背景图,可以添加一张背景(如预览图),不需要可以不传,给一个空格字符串即可.如:@" ";

但不要传 nil ,否则控制台会输出如下图的莫名其妙的语句;

预览图效果:

以下是功能实现代码:

- YYClipImageTool.h

//
//  YYClipImageTool.h
//  YYClipImageDemo
//
//  Created by Arvin on 15/12/22.
//  Copyright © 2015年 Arvin. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface YYClipImageTool : UIImageView
/**!
 *  @param view            要添加到的当前View
 *  @param image           要进行裁剪的图片
 *  @param backgroundImage 可以设置背景图片
 */
+ (void)addToCurrentView:(UIView *)view clipImage:(UIImage *)image backgroundImage:(NSString *)backgroundImage;

@end

- YYClipImageTool.m

//
//  YYClipImageTool.m
//  YYClipImageDemo
//
//  Created by Arvin on 15/12/22.
//  Copyright © 2015年 Arvin. All rights reserved.
//

#import "YYClipImageTool.h"

#define Width view.frame.size.width
#define Height view.frame.size.height
#define imageW image.size.width
#define imageH image.size.height * 0.5
#define duration 1.0f  // 动画持续时间

@interface YYClipImageTool ()

@end

@implementation YYClipImageTool

+ (void)addToCurrentView:(UIView *)view clipImage:(UIImage *)image backgroundImage:(NSString *)backgroundImage {
    
    // 上半部分
    UIImageView *topImgView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, Width, Height * 0.5)];
    topImgView.image = [self clipImage:image withRect:CGRectMake(0, 0, imageW, imageH)];
    
    // 下半部分
    UIImageView *bottomImgView = [[UIImageView alloc] initWithFrame:CGRectMake(0, Height * 0.5, Width, Height * 0.5)];
    bottomImgView.image = [self clipImage:image withRect:CGRectMake(0, imageH, imageW, imageH)];
    
    // 延时操作
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2.5f * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        // 执行动画
        [UIView animateWithDuration:duration animations:^{
            CGRect topRect = topImgView.frame;
            topRect.origin.y -= imageH;
            topImgView.frame = topRect;
            
            CGRect bottomRect = bottomImgView.frame;
            bottomRect.origin.y += imageH;
            bottomImgView.frame = bottomRect;
        }];
    });
    
    // 背景图
    UIImageView *bgImage = [[UIImageView alloc] initWithFrame:view.bounds];
    bgImage.image = [UIImage imageNamed:backgroundImage];
    
    // 添加到视图
    [view addSubview:bgImage];
    [view addSubview:topImgView];
    [view addSubview:bottomImgView];
}

// 返回裁剪后的图片
+ (UIImage *)clipImage:(UIImage *)image withRect:(CGRect)rect {
    CGRect clipFrame = rect;
    CGImageRef refImage = CGImageCreateWithImageInRect(image.CGImage, clipFrame);
    UIImage *newImage = [UIImage imageWithCGImage:refImage];
    CGImageRelease(refImage);
    return newImage;
}

/*
 // Only override drawRect: if you perform custom drawing.
 // An empty implementation adversely affects performance during animation.
 - (void)drawRect:(CGRect)rect {
 // Drawing code
 }
 */

@end

本例在 viewController.m 中调用,代码如下:

//
//  ViewController.m
//  YYClipImageDemo
//
//  Created by Arvin on 15/12/22.
//  Copyright © 2015年 Arvin. All rights reserved.
//

#import "ViewController.h"
#import "YYClipImageTool.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    UIImage *image = [UIImage imageNamed:@"Default_image"];
    [YYClipImageTool addToCurrentView:self.view clipImage:image backgroundImage:@"bgImage"];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (BOOL)prefersStatusBarHidden {
    return YES;
}

@end

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